how to determine my Openstack release name

I am not able to determine the name of Openstack release running on my machine. I tried to match the output of nova package version with webpage listing release name and versions. But my nova package version does not have a match on that site.

stack@Selm:~$ nova-manage --version
12.0.0

This package is not listed on following release site: https://wiki.openstack.org/wiki/Releases

Could someone please tell me how can I determine the release name running on my machine?

Well above answers did not work. Finally an expert help came and here is their answer (that worked). Use the command "git branch -la". It will show a * in front of the release that is running on the system. Below is output from my machine.

In above output * is in front of master. This means that my system is running the current release that was on devstack, which is liberty. Because I followed the following command during installation:

git clone https://git.openstack.org/openstack-dev/devstack

So my system got latest release i.e. liberty. liberty is currently master release so * is in front of master instead of juno or kilo. If some other stable release is required then use following command: